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Vulnerabilities CVE-2026-43334

CVE-2026-43334

High
Open
TLP:CLEAR

Bluetooth: SMP: force responder MITM requirements before building the pairing response

NVD CVE.org
Government Targeting

AI Analysis

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Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: SMP: force responder MITM requirements before building the pairing response smp_cmd_pairing_req() currently builds the pairing response from the initiator auth_req before enforcing the local BT_SECURITY_HIGH requirement. If the initiator omits SMP_AUTH_MITM, the response can also omit it even though the local side still requires MITM. tk_request() then sees an auth value without SMP_AUTH_MITM and may select JUST_CFM, making method selection inconsistent with the pairing policy the responder already enforces. When the local side requires HIGH security, first verify that MITM can be achieved from the IO capabilities and then force SMP_AUTH_MITM in the response in both rsp.auth_req and auth. This keeps the responder auth bits and later method selection aligned.

Details

CVSS Score
8.8
EPSS Score
0.25%

16.7th percentile

CVSS Vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Confidence
90%
Published
May 8, 2026
Last Modified
Aug 5, 2026
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